Peroxidases ativadas por frações protéicas de extrato biológico eficaz na proteção do tomateiro contra a mancha bacteriana

Cavalcanti, F. R.; Resende, Mário Lúcio Vilela de; Oliveira, José T.A.

doi:10.1590/s0100-41582007000600010

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…According to Cavalcanti et al (2007), the early activation of the defense mechanisms, such as the PAL enzyme, are critical to plant's resistance to pathogen, because it acts by converting the phenylalanine amino acid to transcinnamic acid. This conversion starts with carbon channeling from the primary metabolism in phenylpropanoid to the secondary metabolism of plants.…”

Section: Resultsmentioning

confidence: 99%

Induction of defense mechanisms from filtrates of saprophytic fungi against early blight disease in tomato

Solino¹,

Schwan-Estrada²,

Oliveira³

et al. 2016

Afr. J. Microbiol. Res.

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The induction of defense enzymes presents efficient plant disease management when triggered by metabolic products of microorganisms. The aim of the present study is to select filtered saprobes fungi used for the management of early blight of tomato by inducing pathogenesis related to tomato plant. Filtrates of the fungi Curvularia eragrostidis, Curvularia inaequalis, Memnoniella echinata and Pseudobotrytis terrestris were cultured in potato and dextrose (PD) media and maintained in a growth chamber at 25 ± 2°C, with a photoperiod of 12 h light. After 20 days, the mycelial mass was removed through filtration. Concentrations (0, 5, 10, 15 and 20%) of filtrates and Acibenzolar-S-Methyl were applied in the 3rd tomato leaf 3 days before inoculation with Alternaria solani. Then the disease severity was analyzed calculating the area under the disease progress curve. The activity of the enzymes, catalase, guaiacol peroxidase and phenylalanine ammonia-lyase (locally and systemically) at plant control (72 h before inoculation) and 0, 24, 48, 72 and 96 h after inoculation with A. solani was analyzed. C. eragrostidis, C. inaequalis, M. echinata and P. terrestris filtrates reduced the AUDPC, both locally and systemically. Greater activity of phenylalanine ammonia-lyase was observed in plants treated with C. eragrostidis (local and systemic) and C. inaequalis filtrates (local). The filtrate of P. terrestris promoted greater catalase activity, either locally or systemically. The filtrate of M. echinata increased peroxidase activity locally and systemically. The filtrates tested are resistance inducers used for the management of tomato early blight, although further testing is necessary to identify elicitors present in filtrates.

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Section: Resultsmentioning

confidence: 99%

Induction of defense mechanisms from filtrates of saprophytic fungi against early blight disease in tomato

Solino¹,

Schwan-Estrada²,

Oliveira³

et al. 2016

Afr. J. Microbiol. Res.

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EFEITO DE EXTRATOS DE Allamanda blanchetti NO CONTROLE DE Alternaria brassicicola EM MUDAS DE COUVE-MANTEIGA

2015

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RESUMO − O objetivo do presente trabalho foi avaliar o efeito do extrato de uma planta nativa da caatinga (Allamanda blanchetti) no controle do fungo Alternaria brassicicola quanto à indução de mecanismos de resistência em mudas de couve-manteiga e ação fungitóxica direta. Em condições de casa de vegetação, as mudas de couve-manteiga foram pulverizadas com os extratos de A. blanchetti extraídos a quente e a frio, nas concentrações 0, 100, 500 e 1000 ppm. Avaliações da severidade da doença foram realizadas a 5, 6, 7, 8, 9 e 10 dias após a inoculação. Peroxidases foram analisadas em cinco tempos, quais sejam, 0, 24, 72, 120 e 168 horas após a pulverização das mudas com os extratos. Além disso, fora avaliado também a capacidade dos extratos a quente e a frio a 0, 100, 500 e 1000 ppm em inibir a germinação dos esporos de A. brassicicola. As concentrações de 1000 ppm dos extratos a quente e a frio foram as mais eficientes no controle da doença. O extrato de A. blanchetti induziu aumento da atividade de peroxidase às 24 horas após a aplicação dos tratamentos e promoveu inibição da germinação dos esporos de A. brassicicola. Estes resultados indicam o potencial de A. blanchetti no controle de A. brassicicola, tanto pela ação direta quanto pela ativação de mecanismos de defesa. Palavras EFFECT OF THE Allamanda blanchetti EXTRACTS ON THE CONTROL OF Alternaria brassicola IN SEEDLINGS OF KALEABSTRACT − The objective of this study was to evaluate the effect of the extract from a native plant from caatinga (Allamanda blanchetti) in the control of the fungus Alternaria brassicicola, concerning to induction of resistance mechanisms in seedlings of kale and direct fungitoxic action. Under greenhouse conditions, the seedlings of kale were sprayed with extracts from A. blanchetti extracted at hot and at cold at concentrations of 0; 100; 500 to 1000 ppm. Analysis of disease severity were performed at 5; 6; 7; 8; 9:10 days after inoculation. Peroxidases were analyzed five times 0; 24; 72; 120, and 168 hours after spraying the seedlings with the extracts. Furthermore, the capacity of the hot and cold extracts was also evaluated at 0; 100; 500, and 1000 ppm to inhibit the germination of spores of A. brassicicola. The concentrations of 1000 ppm of the hot and cold extracts were more effective in controlling the disease. The extract of A. blanchetti induced an increase in the peroxidase activity at 24 hours after treatment application and promote inhibition of germination of spores of A. brassicicola. These results indicate the potential from A. blanchetti to control A. brassicicola, both by direct action and the activation of defense mechanisms.

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Peroxidases ativadas por frações protéicas de extrato biológico eficaz na proteção do tomateiro contra a mancha bacteriana

Cited by 2 publications

References 13 publications

Induction of defense mechanisms from filtrates of saprophytic fungi against early blight disease in tomato

Induction of defense mechanisms from filtrates of saprophytic fungi against early blight disease in tomato

EFEITO DE EXTRATOS DE Allamanda blanchetti NO CONTROLE DE Alternaria brassicicola EM MUDAS DE COUVE-MANTEIGA

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